argument_base.hh

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#pragma once
 
namespace cli {

struct SpecMemberTag {};

struct OptionTag : SpecMemberTag {};

struct PositionalTag : SpecMemberTag {};

struct CommandTag : SpecMemberTag {};

struct DescriptionTag : SpecMemberTag {};

struct Nargs {
  int min = 0;   
  int max = -1;  
};

enum class Presence { required, optional };

inline constexpr auto required = Presence::required;

inline constexpr auto optional = Presence::optional;
 
namespace nargs {

inline constexpr Nargs none{.min = 0, .max = 0};

inline constexpr Nargs one{.min = 1, .max = 1};

inline constexpr Nargs zero_or_one{.min = 0, .max = 1};

inline constexpr Nargs zero_or_more{.min = 0, .max = -1};

inline constexpr Nargs one_or_more{.min = 1, .max = -1};
 
template <int N>
inline constexpr Nargs exactly{.min = N, .max = N};
 
template <int Min, int Max>
inline constexpr Nargs between{.min = Min, .max = Max};
 
}  // namespace nargs
 
}  // namespace cli